College of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, China.
College of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, China.
Ecotoxicol Environ Saf. 2020 Jan 15;187:109765. doi: 10.1016/j.ecoenv.2019.109765. Epub 2019 Oct 26.
A novel polyvinyl alcohol/carboxymethyl cellulose/yeast double degradable hydrogel was prepared with yeast as a foaming agent. The chemical structure of the hydrogel was characterized by FTIR and XPS. The micro-structure of the hydrogel was observed by SEM. The specific surface area and pore size of hydrogel were measured by BET. Methylene blue adsorption capacity of the hydrogels were investigated and the adsorption mechanism was explored. The biodegradability of double degradable hydrogel was investigated. The results showed that yeast was encapsulated in hydrogel by electrostatic action. With the addition of yeast, not only the specific surface area and average pore size of the hydrogel increased but also methylene blue maximum adsorption capacity of the double degradable hydrogel (110 ± 3.5 mg/g) was significantly higher than that of the hydrogel without yeast (57 ± 1.9 mg/g). The adsorption mechanism was dominated by chemical adsorption and was accompanied by biodegradable and electrostatic adsorption. The kinetic data were fitted to the pseudo-second-order kinetic model reasonably well. The introduction of yeast promoted the biodegradable of hydrogel and increased the degradation rate of polyvinyl alcohol in the material with a maximum degradation rate of 45 ± 2.8%.
一种新型聚乙烯醇/羧甲基纤维素/酵母双降解水凝胶是用酵母作为发泡剂制备的。通过傅里叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）对水凝胶的化学结构进行了表征。通过扫描电子显微镜（SEM）观察了水凝胶的微观结构。通过 BET 测量了水凝胶的比表面积和孔径。考察了水凝胶对亚甲基蓝的吸附容量，并探讨了吸附机制。研究了双降解水凝胶的生物降解性。结果表明，酵母通过静电作用被包封在水凝胶中。加入酵母后，水凝胶的比表面积和平均孔径不仅增加，而且双降解水凝胶（110±3.5mg/g）对亚甲基蓝的最大吸附容量也显著高于没有酵母的水凝胶（57±1.9mg/g）。吸附机制主要是化学吸附，并伴有可生物降解和静电吸附。动力学数据与准二级动力学模型拟合良好。酵母的引入促进了水凝胶的生物降解，提高了材料中聚乙烯醇的降解速率，最大降解速率为 45±2.8%。
